In 2006, he shared corporate documents showing how the National Security Agency was accessing internet data through a secret room in an AT&T office building.

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Mark Klein, a former telecommunications technician for AT&T and a whistleblower, died in Oakland on Saturday at age 79 due to pancreatic cancer. Klein presented evidence from his work alleging that ...

Edward Snowden has lived in Russia for the past 12 years, but a pardon from Trump could see him return to his country of birth.

Mark Klein, the former AT&T employee who helped expose the fact that the National Security Agency was spying on vast amounts of internet traffic in the U.S. during the mid-2000s, has died, according ...

An attorney who represents government whistleblowers on Thursday mocked Homeland Security Secretary Kristi Noem for making a ...

Edward Snowden's actions forced US intelligence agencies to admit extensive spying on their own citizens. It also exposed global surveillance operations undertaken by both the NSA and the GCHQ.